There are 4 performers who will present their comedy acts this weekend at a comedy club. how many different ways are there to schedule their appearances

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

Can someone me with this problem i don't understand i need

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?